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1、西南交通大学硕士研究生学位论文第1I页AbstractThesteeltruss--voncretecompositebeamiSanewkindofcompositestructure,inwhichtheconcretedeckslabandthesteelco-acttogther,hascomeintowidlyuseinhigh-speedrailwaybyEuropean,AmericancountriesandJapanbecauseithasSOmanyadvantagessuchasbigstiffness,lowbuildingheight,goodinteg
2、rity,slightnoisesandwelldynamicbehaviorintraindriving.Alongwiththespeedupoftheexistingrailwayandtherapidconstructionofhigh-speedrailwaythistypebridgemustbewidlyusedinChinatoo.Sothisthesispropsosestostudythestructuralbehaviorofsteeltruss-concretecompositebeam,itissignificant.TlliSthesisintrodu
3、cestheapplicationandcurrentresearchofthesteeltruss-concretecompositebeamathomeandabroad,steeltrussformandcharacteristics,typeofshearconnectorsandbearingcapacitycalculationmethodofthestud,thedifferentcombingconditionofconcreteslabwithstringerandfloorbcamofsteeltruss.Inordertostudythestructural
4、behaviorofthethroughmulti-crossbeamfloorsystemsimply-supportedsteeltruss-concretebeam,theauthorusesofsparefiniteelementcalculationanalysisforaproposed108mspan.Themaincontentsarefollows:1.Reasearchthestructuralbehaviorofthestructure,theaxialforcedistributionbetweenthelOWerboomandthedeck,thes仃e
5、ssdistributionofconcretebridgepanelunder2nd-stagedeadloadandliveloadincludingdouble-tracksymmetrylive10ads.andthenaturalvibrationcharacteristicsofthestructure.2.Reasearchthedisplacementconditionofthe10adsideandunloadsidelOWerboom,thesheardistributionbetweenthetwonodesofthefloorbeam,thetorsion
6、ofthemainsteeltrussunderthesingle-trackliveload.3.Reasearchthe10adstructurestressconditionanditSdistributionoftheconcretebridgedeckunderthreedifferenttemperatureloadwhichcanreflecttheconditionofsuddencooling,sunshineinfluenceandtemperaturegradient.4.Thedegreeofshearconnectionandthestiffnessof
7、floorbeamhavegreateffectonthestressofthesteeltruss-concretecompositebeam,thisthesisalsomadesomestudyonlowerboomdisplacementofthesteeltruss,internalforcesandthestressdistributionofconcretebridgedeckunderdouble-tracksymmetryliveloadswithdiffere
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